linux-kernel - [PATCH 3.12 027/103] tick-common: Fix wrong check in tick_check

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Message-Id: <39760567d0146b23580d41db26b60cd9f873a4df.1401371259.git.jslaby@suse.cz>
Date:	Thu, 29 May 2014 15:48:12 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linaro-kernel@...ts.linaro.org, fweisbec@...il.com,
	Arvind.Chauhan@....com, linaro-networking@...aro.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 027/103] tick-common: Fix wrong check in tick_check_replacement()

From: Viresh Kumar <viresh.kumar@...aro.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 521c42990e9d561ed5ed9f501f07639d0512b3c9 upstream.

tick_check_replacement() returns if a replacement of clock_event_device is
possible or not. It does this as the first check:

	if (tick_check_percpu(curdev, newdev, smp_processor_id()))
		return false;

Thats wrong. tick_check_percpu() returns true when the device is
useable. Check for false instead.

[ tglx: Massaged changelog ]

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Cc: linaro-kernel@...ts.linaro.org
Cc: fweisbec@...il.com
Cc: Arvind.Chauhan@....com
Cc: linaro-networking@...aro.org
Link: http://lkml.kernel.org/r/486a02efe0246635aaba786e24b42d316438bf3b.1397537987.git.viresh.kumar@linaro.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 kernel/time/tick-common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 64522ecdfe0e..271ce26faa21 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -260,7 +260,7 @@ static bool tick_check_preferred(struct clock_event_device *curdev,
 bool tick_check_replacement(struct clock_event_device *curdev,
 			    struct clock_event_device *newdev)
 {
-	if (tick_check_percpu(curdev, newdev, smp_processor_id()))
+	if (!tick_check_percpu(curdev, newdev, smp_processor_id()))
 		return false;
 
 	return tick_check_preferred(curdev, newdev);
-- 
1.9.3

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